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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Complexometric Titration: Overview00:39

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Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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Related Experiment Video

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Generic Protocol for Optimization of Heterologous Protein Production Using Automated Microbioreactor Technology
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Nutrient optimization in bioleaching: are we overdosing?

Carmen Falagán1, Tomasa Sbaffi2,3, Gwion B Williams4

  • 1Environment & Sustainability Institute and Camborne School of Mines, University of Exeter, Cornwall, United Kingdom.

Frontiers in Microbiology
|June 3, 2024
PubMed
Summary

Nutrient levels in biomining can be reduced, especially ammonium, to optimize metal dissolution and redox potentials. Phosphate addition had no effect, but ammonium is crucial for efficient bioleaching of sulfidic ores.

Keywords:
ammoniumbioleachingmedia compositionmicrobial communitynitrogennutrientsphosphatephosphorous

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Area of Science:

  • Biomining
  • Microbial biotechnology
  • Hydrometallurgy

Background:

  • Biomining typically uses high nutrient media (nitrogen, phosphorus, potassium) for microbial growth and efficiency.
  • Nutrients like phosphate and potassium can be naturally present in ores, potentially reducing the need for external supplementation.
  • Understanding nutrient requirements is key to optimizing bioleaching processes.

Purpose of the Study:

  • To investigate the impact of phosphate and varying ammonium concentrations on the bioleaching of low-grade sulfidic ores.
  • To determine the optimal nutrient levels for achieving desired redox potentials and metal dissolution.
  • To analyze the influence of temperature on microbial community structure during bioleaching.

Main Methods:

  • Experimental bioleaching of sulfidic ore with controlled phosphate and ammonium concentrations.
  • Monitoring of redox potentials and dissolution of metals (Co, Cu, Ni, Zn).
  • Analysis of microbial community composition at different temperatures (30°C, 42°C, 60°C).

Main Results:

  • Phosphate addition did not influence bioleaching efficiency.
  • Ammonium addition was essential for achieving high redox potentials (>650 mV vs. Ag/AgCl) and significant metal dissolution.
  • Temperature significantly shaped microbial communities: *Acidithiobacillus* sp. dominated at 30°C and 42°C (unless nutrients were limited, favoring *Sulfobacillus* sp.), while *Sulfolobus* sp. dominated at 60°C.

Conclusions:

  • Nutrient concentrations in bioleaching media can be significantly reduced without compromising efficiency.
  • Ammonium is a critical nutrient for optimizing bioleaching performance in sulfidic ores.
  • Temperature plays a key role in determining the dominant microbial species in bioleaching consortia.